avast - Windows 98 - Microsoft Excel

I am encountering a strange problem with avast. I have installed the avast client on a Windows 98 computer. When user opens Excel, uses file and tries to the save, the program will not save as its files name. It wants to rename it something else. Please see attached graphic. After clicking ok, the file is renamed as the new one and the original file is gone.

There is no problem saving to the My Documents folder. The problem is with the Network Drive.

If I stop the On-Access Protection Excel works with a problem

Is there a log for a Windows 98 installation.

Windows 98
Microsoft Office 2000 Professional (SP3)

Thank for the help!

So, if you stop Standard Shield provider on the client computer, the problem disappears?
What if you only put the network drive to the list of Standard Shield exclusions (on the client computer)?